Pig manure centralized treatment and resource utilization method

Abstract

The invention discloses a pig manure centralized treatment and resource utilization method, which comprises processes of pretreatment, squeezing treatment, biogas production, biogas purification, biogas power generation, biogas slurry separation, guanite crystallization, residual liquid treatment and composting treatment, wherein a biological treatment process is set to be combined with a series of resource recovery strategies so as to realize the zero-emission treatment of the pig manure, and thereby the working environment and the peripheral environment of a hoggery are greatly improved, and the environmental protection and the comprehensive treatment of the hoggery are benefited; the whole process is better integrated, can be combined into an integral device, also can be modularly divided into a functional module of a biogas production generating system, a water purification functional module in high-concentration hoggery sewage and a special-effect organic fertilizer production functional module, and the whole facility occupies small area, has lower investment and operational cost, and is easy to realize equipping; and the invention organically combines the production of biogas, electricity generation, organic fertilizer and guanite, and has good social and economic benefits.

Description

technical field [0001] The invention relates to the technical field of pig manure treatment in pig farms, in particular to a centralized treatment of pig manure and a resource utilization method. Background technique [0002] At present, the general large-scale pig farms produce about 10 tons of pig manure every day. Most pig farms in China adopt the natural stacking mode. The wet manure is directly mixed with dry matter such as straw and sawdust, and then composted for a long time. It often takes 6 months, or more, to complete. In the prior art, there are mainly the following documents for pig manure: [0003] 1, as the patent No. ZL200610070510.1 Chinese invention application patent document "The method for preparing high-efficiency organic fertilizer with livestock and poultry manure" (notification number is CN1962559A); comprise the following steps: mixing and stirring: livestock and poultry manure, filling material and microorganism The starter is fully mixed and stir...

AI Technical Summary

Problems solved by technology

The method of mixing pig manure with dry matter with low moisture content such as straw is used to produce organic fertilizer, and a large amount of nitrogen and phosphorus elements contained in pig manure cannot be extracted and recovered, and the process of making fertilizer is cumbersome and the production cycle is long. The comprehensive utilization rate of pig manure is low

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